Process for the prevention of the bleeding on white animal fibers



Patented Feb. 18, 1936 PATENT OFFICE PROCESS FOR THE PREVENTION OF .THE

. BLEEDING ON WHITE ANIMAL FIBERS Albert Landolt, Basel, Switzerland,assignmto the firm Society of Chemical Industry in Basle,

Basel, Switzerland No Drawing.

Application June 17, 1931, Serial No. 545,145. In Switzerland June 20,1930 7 Claims.

The present invention refers to a process for the prevention of thebleeding out of dyed textiles on white animal fibers, particularly wool,but also natural silks, in presence of aqueous solutions the pH of whichis not greater than 7. It comprises the process herein referred to, andthe wool treated according to the said process.

Dyed wool, as is well known, is washed and milled with aid of solutionshaving a more or less pronounced alkaline reaction. By this operation amore or less considerable amount of the dyestufi is very easily removedfrom the fiber, so that if dyed wool is intended to be washed or milled,the'wool must from the start be dyed with dyestuifs fast to Washing ormilling. Formerly such dyestuffs were the after chroming dyestuffs. Inrecent times other classes of dyestufis have been placed on the marketthe dyeings of which from an acid bath withstand washing and milling.Such dyestufis are for example the products known in the trade as Neolandyestuffs, Lanasol dyestuffs, cloth fast dyestuffs, Fullacine dyestuffs,etc.Neolan, Lanasol and Fullacine being registered trade marks.

However, the wool is not only treated with aid of solutions having analkaline reaction. It can also be treated with solutions which areneutral or weakly acid, 1. e. with solutions the pH of which is notgreater than '7. In these operations (for example water-milling, boilingin presence of acids, or acid-milling) the dyestuffs remain better fixedon the fiber in general than in the case of the treatment with alkalinesolutions. In the said operations, however, in which the pH of thesolution used does not lie above 7, a. stronger bleeding out on whitewool is in general taking place than in the case where the solutionsused are alkaline.

I have now found that the auxiliary agents for the textile industrywhich possess the capability of lowering or eliminating or retarding theafiinity of animal fibers for dyestuffs, are in a remarkable degreeadapted to increase the fa'stness to acid milling, water milling andacid boiling of wool dyed with dyestuffs which dye from an acid bath.They are particularly capable to'prevent the bleeding out of the dyedwool on white wool milled or boiled along with it.

Such textile auxiliary agents, which are able to lower or eliminate orretard the affinity of anisulfonic acids, such as naphthalene sulfonicacid,

with alcohols (aliphatic, cyclic, aromatic-aliphatic alcohols),--suchcondensation products correspond to the various brands known on themarket under the registered names Nekal" and I Leoni1'; the productswhich can be obtained by condensation of aromatic sulfonic acids with Ibenzoin and, if necessary, by further condensation with alcohol; furthersulfo ricinates, such as the Prestabite oils of the commerce; furthersynthetic tanning agents, such as the condensation products offormaldehyde with naphthalene -sulfonic acids, etc.

Since the number of acid wool dyestuffs is considerable which bleed outin acid and water milling, or when boiled in an acid bath and,therefore, stain white wool milled or boiled along with the dyed wool,the present process constitutes a great technical advance.

The following examples illustrate the invention, the names Kiton,Neolan, Katanol, Thiotan, Lanasol, Fullacid, Nekal, Rhodamine, Leonil,Prestabite, Tartrazine mentioned therein being registered trade marks.

Example 1 W001 is dyed as usual in an acid bath with 3 per cent. of acidblue RBF (Colour Index page 337), and then subjected to the followingacid milling: The dyed wool mixed with 50 per cent. of white wool ismilled for 4 hours in a milling bath containing per litre 1 gram ofsulfuric acid, and 5 per cent. of the product obtained by condensingnaphthalene-B-sulfonic acids with benzoin and isopropylalcohol (of.Example 1 of Patent No. 1,833,245), calculated on the weight of thewool. Proportion of material to milling liquor 1:50. The white woolmilled along with the dyed wool is not or only very slightly stained,whereas strong bleeding takes place without the addition of thementioned product.

' Example 2 W001 is dyed as usual with 2 per cent. of Kiton fast orangeG (Colour Index No. 27-) and subjected, after having been mixed withwhite wool,

to the following water milling: the milling is performed during 4 hoursat 50 C. in a milling bath containing per litre 5 per cent. of theproduct obtained by condensing naphthalene-B-sulionicacids with benzoinand isopropyl alcohol (cf. Example 1 of Patent No. 1,833,245),calculated on the weight of the wool. Proportion of material to millingliquor 1:50. In this manner the bleeding of the dyestufi used on whitewool is 5 prevented to a great extent, which is not the case without theaddition.

Example 3 W001 is dyed with 3 percent. of Neolan orange m GRE (Schultz1932, vol. 2, page 154) in the manner usual for Neolan colors and thedyed material, which may be mixed with white wool, is subjected to thefollowing acid milling: 1 litre of milling liquor contains 1 gram ofsulfuric acid and 5 per cent. of Katanol WL calculated on the weight ofthe wool. Milling is performed during 4 hours at 50 C. The dyestuff doesnot stain white wool, but strong bleeding takes place without theaddition of Katanol WL.

Example 4 W001 dyed with 3 per cent. of Neolan green B (Colour IndexSupplement, page 46) is boiled along with white wool in an acid bath ofthe following composition: 1 litre of water, 1 gram of sulfuric acid and10 per cent. of the product obtained by condensingnaphthalene-fl-sulfonic acids with benzoin and isopropyl alcohol (cf.Ex-

ample 1 of Patent No. 1,833,245), calculated on the weight of the wool.The whole is boiled for A hour, after which time the dyestuif hasstained 4 the white wool quite considerably less than had the additionof the said product to the acid boiling bath not been made. The shade ofthe dyed goods changes very much less with addition, than withoutaddition of-the mentioned product.

. Example 5 In a hot acid bath wool dyed with Kiton blue A (Colour IndexNo. 714) bleeds very strongly on to white wool. This bleeding out can beprevented if 2 grams of Katanol W per litre of treating liquor are addedto the boiling acid bath. Even after boiling for one hour, white wool isnot bleeded on when treated in this manner.

Example 6 A material dyed with Orange II (Colour Index No. 151) issubjected in the following manner,

in the presence of white wool, to an acid-milling:The milling is carriedout for 4 hours with 2 grams of sulfuric acid per litre, at atemperature of C. In this operation white wool is very strongly bleededon by orange II. However, if 2 grams of Thiotan RS per litre are addedto the acid-milling bath, white wool is scarcely bleeded on. In asimilar manner behave other acid wool dyestufls, such as: Tartrazine,(Schultz 1931,

vol. 1, No. 737) Alizarine fast violet R, (Colour Index Supplement, page26) Lanasol green G, (Schultz 1932, vol. 2, page 142) Kiton fast red4BL,.(Schultz 1932, vol. 2, page 138) and even direct dyeing dyestuffs,such as direct fast scarlet WS (Colour Index Supplement, page 39).

- Example 7 v A dyeing made with 3 per cent. of Fullacid red G (Schultz1932, vol. 2, page 111) is treated for 4 hours at 50 C. with a millingliquor containing per litre water 2 grams of Katanol W.

The wool dyed with Fullacid red G does not bleed on to white wool orsilk milled along with it, which would be the case without the saidaddition.

Example 8 Wool dyed with 3 percent. of Kiton red G (Colour Index No. 31)is boiled together with white wool in a bath containing 4 per cent. ofsulfuric acid, 10 per cent. of Glaubers salt and 2 grams per litre ofthe product obtained by condensing naphthalene-p-sulfcnic acidswithbenzoin and isopropyl alcohol (cf. Example 1 of Patent No. 1,833,245). Ableeding of the dyestufl on to white wool boiled along with the dyedwool 10 hardly takes place. f

Example 9 Woollen material dyed with 3 per cent. of Kiton fast orange G(Colour Index No. 27) is 15 subjected to an acid milling according toExample 7 above, while adding 2 grams of Nekal BX (probably a butylatednaphthalene sulfonic acid) per litre of milling liquor. By the saidaddition the bleeding, of the dyestuif on to white wool 20 milled alongwith the dyed wool is prevented. In a similar manner behave thedyestufis: Kiton red 6B (Colour Index No. 57) Kiton red S (Colour IndexNo. 54), Kiton fast red R (Colour Index, page 357), acid Rhodamine 3R(Colour Index, page 337), acid violet GBN (Colour Index No. 717), Kitonpure blue V (Colour Index No. 672 cf. Supplement page 44), benzyl greenB (Colour Index No. 667), etc.

Example 10 The so-called water-milling, as described in Example 8, iscarried out with woollen material dyed with 3 per cent. of brilliantKiton red B (Colour Index No. 748) The milling liquor contains 2 gramsof Leonil S (probably an alkylated naphthalene sulfonic acid) per litre.The dyestuff which, without this addition, bleeds strongly on whitewool, leaves the same almost pure white.

Example 11 The bleeding out of the 'dyelng made with benzyl violet 5BN,(Colour Index No. 698) in an acid boiling bath according to Example12,.can be prevented by adding 2 grams per litre of the condensationproduct of naphthalene sulfonic acid and formaldehyde. It is to be notedthat not only the white wool boiled along with the dyed material, butalso white cotton which may be present, were protected against thebleeding on.

Example 12 The acid milling described in Example 7 is carrled out withdyeings of 3 per cent. (calculated on the weight of the wool) of Kitonblue A (Colour Index No. 714). An addition of 2 grams per litre of thecondensation product of naphthalene sulfonic acid and formaldehydeprevents the bleeding out of the dyestufi on to white wool and 60 whitecotton.

Example 13 The water-milling described in Example 8 is carried out witha woollen material dyed with 2 5 ing, water milling and acid boiling isalso manifest, if the wool to be dyed is already treated in the dyeingbath with the said additions, and then carrying out the mentionedfastness tests without further additions.

What I claim is:

1. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous milling of dyed wool and undyed wool in anaqueous solution having a pH-value not greater than '7, consisting inadding to the solution a textile auxiliary obtained by causing acompound selected from a group of products consisting of alcohols andaldehydes to react with a napthalene sulfonic acid.

2. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous milling of dyed wool and undyed wool in anaqueous solution having a pH-value not greater than '7, consisting inadding to the solution a textile auxiliary obtained by causing acompound selected from a group of products consisting of alcohols andaldehydes to react with a naphthalene monosulfonic acid. I

3. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous acid milling of dyed wool and undyed wool in anaqueous solution having a pH-value smaller than '7, consisting in addingto the solution a textile auxiliary obtained by causing a compoundselected from a group of products consisting of alcohols and aldehydesto react with a naphthalene sulfonic acid.

4. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous acid milling of dyed wool and undyed wool in anaqueous solution having a pH-value smaller than 7, consisting in addingto the solution a textile auxiliary obtained by causing a compoundselected from a group of products consisting of alcohols and aldehydesto react with a naphthalene monosulfonic acid.

5. Process for the prevention of the bleeding of dyed Wool onto undyedwool in the simultaneous acid milling of dyed wool and undyed wool in anaqueous solution having a pH-value smaller than 7, consisting in addingto the milling bath a condensation product from formaldehyde and anaphthalene sulfonic acid.

6. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous acid milling of dyed wool and undyed wool in anaqueous solution having a pH-value smaller than 7, consisting in addingto the milling bath a condensation product from benzoin and anaphthalene sulfonic acid'.

7. Process for the prevention of the bleeding of dyed wool onto undyedwool in the simultaneous acid milling of dyed wool, and undyed wool inan aqueous solution having a'pH-value smaller than '7, consisting inadding to the milling bath a condensation product from butyl alcohol anda naphthalene sulfonic acid.

ALBERT LANDOLT.

